A=8 , B=5, C=4, D=2

A 1. A negative feedback control system has a proportional controller with a variable gain K which controls a process with transfer function 352 +c. and a unity feedback. Find the system transfer function What is the characteristic equation for this system? Where are the poles of this system when K=0? When K increases? Use Matlab's ezmar function to plot the roots for K = 0 to 100 (in steps of 20). (Use the hold on command after each plot to keep all plots in one figure.)